f7df532ec0
1. External 32kHz crystal is started for too long or it may not start at all. It is often observed at the first start. 2. At the first start, it is possible that the crystal did not start. And the recorded period was recorded as 0. Which led to a division error by zero during the transition to the deep sleep mode (Maybe somewhere else). 3. Added a unit test to test a new method of oscillation an external crystal. 4. Added a new method of oscillating of an external crystal. The legs of the crystal are fed with a 32 kHz frequency. The new method eliminates these errors. Added unit test: `\esp-idf\components\soc\esp32\test\test_rtc_clk.c`: `make TEST_COMPONENTS=soc` - 8 Test starting external RTC crystal. Will pass. `Bootstrap cycles for external 32kHz crystal` - is specified in the file Kconfig by default 100. QA tested a new method of oscillation the crystal on 25 boards. The supply of square waves on the crystal showed a 100% result in contrast to the previous method of launching the crystal. After the tests, the old method was deleted. Closes TW19143
45 lines
1.3 KiB
C
45 lines
1.3 KiB
C
// Copyright 2015-2017 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#pragma once
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/**
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* @file esp_clk_internal.h
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*
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* Private clock-related functions
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*/
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/**
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* @brief Initialize clock-related settings
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*
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* Called from cpu_start.c, not intended to be called from other places.
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* This function configures the CPU clock, RTC slow and fast clocks, and
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* performs RTC slow clock calibration.
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*/
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void esp_clk_init(void);
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/**
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* @brief Disables clock of some peripherals
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*
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* Called from cpu_start.c, not intended to be called from other places.
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* This function disables clock of useless peripherals when cpu starts.
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*/
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void esp_perip_clk_init(void);
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/* Selects an external clock source (32 kHz) for RTC.
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* Only internal use in unit test.
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*/
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void rtc_clk_select_rtc_slow_clk();
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